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HP Forums / HP Calculators (and very old HP Computers) / General Forum v / HP 25 new internal power supply

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HP 25 new internal power supply
05-01-2021, 12:19 AM
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Dreato Offline
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HP 25 new internal power supply
I just obtained an HP 25 with a new style of internal power supply I've never seen before. It's on a daughterboard, and supplies +6, -12 and 4 volts, as the old style does, but has fewer discrete components. It's got a couple of electrolytic caps, and 2 inductor circuits. The calculator chip complement is different, too.

Can anyone enlighten me?

Regards,

Dave


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HP 25 new internal power supply - Dreato - 05-01-2021 12:19 AM



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